You will already have our reference track; what we need is your part (not mixed) in a WAV or AIFF file, and a reference file (MP3 is good enough) which shows how your part fits into the tune. There are a couple of ways to do this:

• Record your part into one channel of a stereo track and our reference track into the other, then export to WAV or AIFF.
• Export one WAV or AIFF with your part solo, then an MP3 (or other common format) with your part mixed into our reference track.

Our uploader for large files is powered by the Send This File service, and while it dependably delivers files of all sizes (subject to the 2GB limit) over virtually any Internet connection, it does have one little quirk: if the upload speed is less than about 150 Kb/sec the Progress Bar gets bored and takes a nap. This makes it look like the file sending failed, because the timer and percent-transmitted stop, and the completion-screen is never displayed. Fortunately this is an illusion.

Not all "high-speed Internet" services are equally fast, especially when it comes to uploading; in particular some Satellite Internet, 3G Wireless, and DSL tend to be a bit on the slow side when it comes to upstream (upload) speed. (If you are curious about your Internet speed, go to Speedtest.net or Speedof.me and check - it's free!)

The Send This File progress bar tends to malfunction if the transmit speed stays below 150 Kb/sec, but the transmission continues in the background (If you like to play with network monitoring tools, check it out - it's really weird. If you aren't that much of a geek, read on.)

The real problem is: How do I know when I'm done? Well, our resident geek came up with an easy answer. Look at the file size in MB (megabytes) of the file you sent, and then at the transmit speed:

• If your speed is 128 Kb/sec, the file will take about 1 minute per megabyte to send
• If your speed is less than 128 Kb/sec it will take a bit longer: 128 divided by[your speed], times the file size in MB will be about how many minutes it will take to send
• f your speed is faster than 128 Kb/sec it will go faster; use the above equation to estimate - or just watch the progress bar, as it is likely working by now

If you don't want to mess with checking network activity, just let it sit a bit longer than suggested above, then ask us if we received it - we are as interested in getting to work as you are, and will be happy to help you get your file successfully transmitted